Field VAT number with invoice (problem)

Hello,

in the documentation I read that the plugin is compatible with “WooCommerce PDF Invoices & Packing Slips”.

But I create a field called VAT number (essential in Europe) and it does not appear on the invoice.
Do I understand that it is an ID problem? Creating a new field generates the ID “billing_wooccm11” and maybe it should be “billing_vat_number”.

How can I solve the problem?

Thank you so much ??